Experience Points

Experience Points, or XP, are a value to describe a player's progress in the Bloons Tower Defense games. In Bloons TD 4 and Bloons TD 5 it is awarded for popping Bloons. The player gets 1 XP point per 1 Bloon popped but the XP gained for popping bloons is not equal to RBE. For example, reducing M.O.A.B. to Ceramic Bloons takes 200 hits so 200 points to RBE but since it only registers as a pop, the player will only receive a single XP point. The player gets a new Rank when they reach certain amounts of XP.

In BTD4, the bar showing how much XP you had also showed how many more bloons you had to pop before you go up a rank. In BTD5, the information is shown as pop up message when the player hovers the mouse over the XP bar. Bloons also give less XP starting at round 71.

This is how much XP the bloons give in certain rounds:

Rounds 1-70: Bloons give 100% XP

Rounds 71+: Bloons give 30% XP

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The player also gets Tower XP in BTD5. It is gained by using the towers. The more towers of a kind are used the more Tower XP for the type of the tower is gained. Certain amounts unlock new tower upgrades for each tower. Final upgrades must be unlocked also by reaching a certain Rank, such as the Ray of Doom.The path 1 upgrades usually require less XP than the path 2 ones(An exception is Arctic Wind).

In BTD5, the player can replay the Daily ChallengesThird Time's A Charm (July 2nd, 2012), The Daring Dozen(January 27th 2014) or 20 Ceramics on the Wall (July 30th, 2012) to earn millions of Experience Points.

In Freeplay Mode of BTD5, the amount of experience gained per popped bloon slowly goes down, gradually making it an ineffective way to gain experience.

In BTD5, the maximum amount of XP is 179,995,343,055,540,813,000, while the player is still at Rank 200 with that amount. The amount needed to go to the next Rank (with the maximum amount) is -179,995,343,055,539,813,000.